Dyeing preparation for cellulose esters



Patented Apr. 17, 1928.

UNITED STATES- I 1,66 ,115 PATENT OFFICE.

RICHARD METZGEB, OF HEIDELBEEG, GEBKLNY, SSIGNOB, TO GRASSELLI DYESTUIFCORPORATION, OF NEW YORK,

DEPAWARE.

No Drawing. Application filed am, 4,

esters may be effected from a neutral bath,

or in contradistinction to preparations containing soap, or salts orsulfonated fatty acids, from acid dye-baths, accordingly, it is possibleto produce multl-colour effects 29 in a single bath not only on mixedfabrics of cotton and cellulose esters, but also of cellulose esters andanimal fibres, for example wool. Of course, the new preparations canalso be employed in. weakly alkaline liquors, for example in conjunctionwith soap. For printing cellulose esters the new reparations are appliedwith the usualthickening agents and steamed.

The molasses may be replaced in part by 30 concentrated sulfitecellulose waste liquor. The preparations may also contain furthercomponents as for example protective colloids or other substances usefulin dyeing and the like. They are best made in a concentrated form,perferably as a paste, and in such form have the advantageof allowing nodyestuif to separate and not being damaged by severe cold, andaccordingly they can be shipped also during the winter; they can alsoeasily be transformed into solid products for example by evaporation invacuo. As examples of substances suitable for dyeings on celluloseesters,

use in producing weakly such as nitro-aryl-amines oramino-anthroquinones, may be cited, but .any other organic compoundswhich are ca ablev of d1- rectly producing dyeings in ful and deepshades useful for practicalfipurposes on cellutai lose esters, but arenot su ciently soluble in water to permit the use of their aqueoussolutions for producing such dyeings, may be employed as well.

My invention will be further illustrated Y ever,

basic aromatic amino compounds,

not suflicient y soluble BY mmussremlmrrs, n. 2., a conronxrrou orDYEING rnnrnfwrron Ion cELLunosn Es'rm.

1926, mm m1 02,340, and in re. m 1, 1925.

the following examples to which, howthe invention is not limited. Theparts are by weight.

Example 1.

23.4 parts of a press-cake containing 85.4 per cent of ammo-azo-benzeneare well mixed with 72.4 partsof molasses and ground for some time with4.2 parts of water. "he preparation so obtained when diluted with watergives a bath suitable for dyeing acetyl cellulose without any' furthertreatment.

Ewample i2.

7 8 parts of beet sugar molasses, 2 parts of saporiin and 20 amine aremixe with each other in the manner described in Example 1.

330 parts of a press-cake containing per cent of1.4.5.8-tetra-amino-anthraquinone, 550 parts of molasses, 100 arts "ofconcentrated purified sulfite cel ulose waste liquor and 20 parts ofsodium dicresyl-phos-- phate are intimatel mixed. A homogenous paste isobtained rom which the dyestuif does notseparate even when very much diluted with water. r

Instead of the" said tetra-amino-anthraquinone other compounds, for examle other amino-anthraquinones or aminoydroxyanthraquinones orsubstitution products thereof may be used as well.

I claim:

1. As a new composition of matter, a mixture comprising an organicsubstance which is capable of directly producing dyeings' in full anddeep shades on cellulose esters, but not sufiiiciently soluble in waterto permit producing such dyeings, and molasses.

2. As a newcomposition of matter, a mixture comprisin an organicsubstance which is capable of irectly producing dyeings in full and deeshades on cellulose esters, but in water to permit the use of itsaqueous solution for producing such d eings, molasses and sulfitecellulose waste iquor.

3. As a new composition of matter a mixture comprising a weekl basicaromatic amino compound Whichjfi capable of (11 parts ofdi-nitro-diphenylthe use of its aqueous solution for rectly producingdyeings in full and deep shades on cellulose esters, but notsufiiciently soluble in water to permit the use of its aqueous solutionfor producing such dyeings, and molasses.

4. As a new composition of matter a. mixture comprising a. weeklg; basicaromatic amino compound which 18 capable of directly producing dyeingsin full and deep shades on cellulose esters, but not sufliciently 1 Intestimony whereof I have hereunto 15 set my hand.

RICHARD METZGER.

